CN208654464U

CN208654464U - A kind of cornea K value superelevation or ultralow Ortho-K

Info

Publication number: CN208654464U
Application number: CN201821211656.8U
Authority: CN
Inventors: 王江桥
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-07-30
Filing date: 2018-07-30
Publication date: 2019-03-26
Anticipated expiration: 2028-07-30

Abstract

The utility model is suitable for Ortho-K field, a kind of cornea K value superelevation or ultralow Ortho-K are provided, the utility model is calculated by carrying out optometry with accurately corneal topography diagram data plus ophthalmology empirical data, Ortho-K is solved in the orientation problem of these special corneal surface shapes, Ortho-K is applicable to the flat K value of cornea in 46.5D to 53D and in the cornea of 39.00D to 33.5D range, to expand the use scope of Ortho-K significantly.

Description

A kind of cornea K value superelevation or ultralow Ortho-K

Technical field

The utility model belongs to Ortho-K field more particularly to a kind of cornea K value superelevation or the modeling of ultralow cornea Shape mirror.

Background technique

Ortho-K originates from the U.S., is a kind of hard corneal contact lens of similar contact lenses, mainly passes through night It is worn on the curvature that cornea is gradually changed on cornea, to achieve the purpose that correct defects of vision.Ortho-K is hard using gas permeability Property Contact Lens, i.e., the spectacle lens of usually said RGP material production, it is in air-locked hard material PMMA base Grow up on plinth.

Ortho-K design is generally using eyeglass is tried on, and with assessment technology is tried on, lens parameters determination cannot rely on one Secondary evaluation is just completed, and is generally required repeatedly, the assessment of the eyeglass of assessment repeatedly, especially Dai Jinghou different time.It is moulded wearing Evaluating Fluorescence Emission can be carried out after shape eyeglass -2 hours 20 minutes again.And cornea moulding is tested the key factor matched and how is by glimmering Piece is tried in the assessment adjustment of light element on, eventually finds suitable eyeglass.Assessment technology is tried on due to using, and is limited to the observation of doctor's eyes Identification of the precision to fluorescein map can only be designed for the Ortho-K of (39.5D to 46D) within the scope of certain cornea K value, Correct light medium myopia, it is impossible to be used in correction is higher and more low k cornea various ametropia.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a kind of cornea K value superelevation or ultralow cornea to mould Shape mirror, it is intended to which solving existing Ortho-K, can not to correct cornea K value higher and more low k cornea outside 39.5D to 46D Various ametropia technical problems.

The utility model adopts the following technical solution:

The Ortho-K is followed successively by base curve area i.e. BC arc, reversion arc area i.e. RC arc, positioning arc area i.e. AC from the inside to the outside Arc and circumference arc area, that is, PC arc, it is right when the Ortho-K is designed for cornea of the flat K value of cornea in 46.5D to 53D Answer the AC arc curvature value of Ortho-K in 46.5D to 53D range, when the Ortho-K is designed for the flat K value of cornea In the cornea of 39.00D to 33.5D, the corresponding AC arc curvature value of Ortho-K is in 33.5D to 39.00D range.

The beneficial effects of the utility model are: for cornea K value superelevation or ultralow some special corneal surface shapes, it is existing Suitable Ortho-K can not be designed by trying assessment technology on, and the utility model solves Ortho-K in these special angles The orientation problem of film form, Ortho-K are suitable for the flat K value of cornea in 46.5D to 53D and in 39.00D to 33.5D model The cornea enclosed, to expand the use scope of Ortho-K significantly.

Detailed description of the invention

Fig. 1 is the structure chart of Ortho-K provided by the utility model；

Fig. 2 is a kind of corneal topography of inclined flat cornea of exception；

Fig. 3 is the corneal topography of another abnormal inclined flat cornea；

Fig. 4 is the corneal topography of two high-k corneas.

Specific embodiment

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.

As shown in Figure 1, Ortho-K is successively base curve area (BC arc) 1, reversion arc area (RC arc) 2, positioning from the inside to the outside Arc area (AC arc) 3 and circumference arc area (PC arc) 4, diagram label 5 are cornea.The utility model embodiment designs BC arc first, Then RC arc is designed, arc AC arc and PC arc are finally designed.The specific implementation process is as follows:

Step S1, BC arc is designed:

Wherein the partially flat K value-in BC arc curvature value=center is estimated reduces shading value, to realize that BC arc quantitatively corrects cornea view light The radius of curvature in area is corrected various ametropia.

Step S2, RC arc is designed:

Wherein RC arc curvature value ratio BC arc curvature value increases 2D to 10D；

Step S3, AC arc is designed:

Wherein AC arc data include the AC arc curvature value ACf in the flat direction and AC arc curvature value ACs in precipitous direction, this In ACf take the smallest K value Kf in 7 millimeters of areas on corneal topography, ACs to take the maximum K value Ks in 7 millimeters of areas on corneal topography.

There are 3 millimeters of areas, 5 millimeters of areas and 7 millimeters of areas on corneal topography.Fig. 2 shows a kind of angles of the inclined flat cornea of exception Film topographic map, diagram circle is outside 7 millimeters of areas.This step can be related to two data: flat direction when designing AC arc data The AC arc curvature value ACf and AC arc curvature value ACs in precipitous direction.ACf takes the smallest K value Kf in 7 millimeters of areas on corneal topography, That is ACf=Kf, the smallest K value Kf in 7 millimeters of areas as shown in Figure 2 are 38.81D, and ACs takes 7 millimeters of area's maximums on corneal topography K value Ks, i.e. ACs=Ks, the maximum K value Ks in 7 millimeters of areas as shown in Figure 2 is 40.81D.

Fig. 3 shows the example of the corneal topography of the inclined flat cornea of another exception, and in figure, the smallest K value Kf in 7 millimeters of areas is 38.86D, the maximum K value Ks in 7 millimeters of areas are 41.14D.

For another example, Fig. 4 shows the corneal topography of two high-k corneas, wherein in the corneal topography in left side, 7 millimeters The smallest K value Kf in area is 46.45D, and the maximum K value Ks in 7 millimeters of areas is 47.91D, and in the corneal topography on right side, 7 millimeters of areas are most Small K value Kf is 46.20D, and the maximum K value Ks in 7 millimeters of areas is 48.12D.

Therefore this step can be designed AC arc according to corneal topography.

Step S4, PC arc is designed:

Wherein PC arc curvature value ratio AC arc curvature value reduces 2D to 10D.

The utility model embodiment uses corneal topography total corneal data, integrative medicine optometry, the cornea modeling designed The cornea of shape mirror applicable super high-k (46.5D to 53D range) and super low k (6.5D to 53D range).If Ortho-K Cornea designed for the flat K value of cornea in 46.5D to 53D (i.e. radius of curvature arrives 7.25mm 6.36), Ortho-K pair The AC arc curvature value range answered is 46.5D to 53D (i.e. radius of curvature arrives 7.25mm 6.36), if Ortho-K is designed for For the flat K value of cornea in the cornea of 39.00D to 33.5D (i.e. radius of curvature arrives 10.07mm 8.65), Ortho-K is corresponding AC arc curvature value range is 33.5D to 39.00D (i.e. radius of curvature arrives 10.07mm 8.65).

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model Protection scope within.

Claims

1. a kind of cornea K value superelevation or ultralow Ortho-K, the Ortho-K are followed successively by base curve area from the inside to the outside That is BC arc, reversion arc area, that is, RC arc, positioning arc area, that is, AC arc and circumference arc area, that is, PC arc, which is characterized in that when the cornea is moulded Shape mirror is designed for the flat K value of cornea in the cornea of 46.5D to 53D, and the AC arc curvature value of corresponding Ortho-K is in 46.5D To 53D range, when the Ortho-K is designed for cornea of the flat K value of cornea in 39.00D to 33.5D, cornea moulding The corresponding AC arc curvature value of mirror is in 33.5D to 39.00D range.